Don't understand why this AttributeError: 'Graph' object has no attribute 'merge_one' is occurring

Question

我正在学习教程，我正在使用最后一个 python2（自制软件）和 PyCharm（配置了项目解释器）- 但我被困在这部分：

from py2neo import Graph, Node
graph = Graph()
nicole = Node("Person", name="Nicole")
graph.create(nicole)
graph.delete(nicole)
nicole = graph.merge_one("Person", "name", "Nicole")

错误：

Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
AttributeError: 'Graph' object has no attribute 'merge_one'

我已经检查了 documentation，看来我一切正常。我尝试卸载并安装最新版本的 py2neo 但没有成功。我如何解决这个问题？

预期行为：运行来自 python2 控制台的命令：如果该人存在，请不要复制它，而是更改其值，如果不存在，请创建它。

Answer 1

通过检查 the source code，我认为您要查找的函数是 Graph.match_one。还有一个函数 Graph.merge，但它没有将 Node 作为参数。

Answer 2

我很快就使用了版本 4 而不是版本 2。所以使用 Graph.merge，正如@littlebenlittle 所建议的那样，解决了问题：

jonh = Node("Person", name="Jonh", age = 21)
graph.create(jonh)
ana = Node("Person", name="Ana", age = 44)
graph.create(ana)
michael = Node("Person", name="Ana", age = 33)
graph.merge(michael, "Person", "name") # So the age of Ana will change to 33, as expected.

要使用与我的问题相关的命令，必须安装版本 2，例如。直接来自 py2neo 仓库：

pip install https://github.com/technige/py2neo/archive/release/2.0.7.zip

Don't understand why this AttributeError: 'Graph' object has no attribute 'merge_one' is occurring

Don't understand why this AttributeError: 'Graph' object has no attribute 'merge_one' is occurring

python

neo4j

py2neo